Answer:
The box is moved at constant speed, then the change in kinetic energy is zero.
Explanation:
Let suppose that box moves at constant speed, meaning that its kinetic energy ([tex]K[/tex]), measured in joules, is expressed by the following equation:
[tex]K = \frac{1}{2}\cdot m\cdot v^{2}[/tex] (1)
Where:
[tex]m[/tex] - Mass, measured in kilograms.
[tex]v[/tex] - Speed, measured in meters per second.
If the box moves at constant speed, then we notice that [tex]v_{f}^{2}-v_{o}^{2} = 0[/tex], therefore, [tex]\Delta K = 0[/tex]. In a nutshell, if the box is moved at constant speed, then the change in kinetic energy is zero.
What happens to energy as frequency increases on the electromagnetic spectrum?
What is the density of an object with a mass of 12.0 g and a volume of 2.3 mL?
A student throws a 0.22 kg rock horizontally at 20.0 m/s from 10.0 m above the ground. Find the initial kinetic energy of the rock.
Answer:
44J
Explanation:
Given parameters:
Mass of rock = 0.22kg
Initial velocity = 20m/s
Distance moved = 10m
Unknown:
Initial kinetic energy of the rock = ?
Solution:
To solve this problem, we need to understand that kinetic energy is the energy due to the motion of a body.
It is mathematically expressed as;
Kinetic energy = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the velocity
Kinetic energy = [tex]\frac{1}{2}[/tex] x 0.22 x 20² = 44J
How could I track my running speed without a car or special equipment?
Which of the following statements are true about whether atoms tend to gain
or lose electrons?
A. Atoms with four valence electrons will always lose electrons.
B. Atoms with eight valence electrons easily lose electrons.
C. Atoms with five, six, or seven valence electrons will gain
electrons.
D. Atoms with one, two, or three valence electrons will lose
electrons.
Answer:
The true statements are;
C and D
Explanation:
The tendency of an atom to gain or lose electrons in a chemical reaction are given by its electronegativity and electropositivity respectively
Electronegativity is a measure of an atom's capacity to attract electrons from neighboring particles, with atoms that are more likely to gain an electron, being described as having a higher electronegativity
Electronegativity increases across the period with increasing number of valence electrons, therefore, elements with five, six, or seven electrons, which are located on the far right of the periodic table are said to have higher electronegativity and therefore more likely to gain electrons in a chemical reaction
Electropositivity is the quantification or measure of an element to donate or give electrons and become positively charged ions in a chemical reaction
The fewer the number of valence electrons an element has, the more likely the element will undergo a reaction by donating the valence electrons to a more electronegative atom and become positively charged
Electropositivity decreases across the period and therefore, elements with one, two, or three valence electrons which are located in groups I, II, and III, are more likely to lose electrons in a chemical reaction
Answer:
C+D
Explanation:
What is a cars acceleration in the direction of motion when velocity changes from 20. M/s to 60. M/s in 10. S
Answer:
Acceleration, [tex]a=4\ m/s^2[/tex]
Explanation:
Given that,
Initial velocity, u = 20 m/s
Final velocity, v = 60 m/s
Time, t = 10 s
We need to find the acceleration of the car. It is equal to the change in velocity divided by time.
[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{60-20}{10}\\\\a=\dfrac{40}{10}\\\\a=4\ m/s^2[/tex]
So, the acceleration of the car is [tex]4\ m/s^2[/tex].
no, this question isn't abt language arts, mathematics. Im asking u this
How are u doing? c:
Answer:
horrible, but how about you?
Explanation:
A figure skater on ice spins on one foot. She pulls in her arms and her rotational speed increases. Choose the best statement below.
1. Her angular speed increases because by pulling in her arms she creates a net torque in the direction of rotation.
2. Her angular speed increases because air friction is reduced as her arms come in.
3. Her angular speed increases because her angular momentum increases.
4. Her angular speed increases because her angular momentum is the same but her moment of inertia decreases.
5. Her angular speed increases due to a net torque exerted by her surroundings.
6. Her angular speed increases because her potential energy increases as her arms come in.
Answer:4
Explanation:
Trust me I'm a student
The rotational speed increases when the skater pulls her arms in because the moment of inertia decreases.
What is Angular momentum?It is the rotational momentum of the rotating object. It can be defined as the product of the moment of inertia and angular velocity.
[tex]L = I \omega[/tex]
Where,
[tex]L[/tex] - Angular momentum
[tex]I[/tex] - moment of inertia = [tex]mr^2[/tex]
[tex]\omega[/tex]- angular velocity
From the equation, the angular velocity of the body is inversely proportional to the moment of inertia.
When the skater pulls her arms in, the moment of inertia decrease due to a decrease in radius,
Therefore, the rotational speed increases when the skater pulls her arms in because the moment of inertia decreases.
Learn more about Angular momentum:
https://brainly.com/question/16970852
I NEED HELP ASAP
Click to review the online content. Then answer the question(s) below, using complete sentences. Scroll down to view additional questions.
Describe how you would use vectors to represent an object moving at a constant velocity. Describe how you would use vectors to represent an accelerating object. (site 1)
Answer:
have a good day and just to let you know plz don´t copy and paste this put is into your words
Explanation:
Vector diagrams are diagrams that depict the direction and relative magnitude of a vector quantity by a vector arrow. Vector diagrams can be used to describe the velocity of a moving object during its motion. For example, a vector diagram could be used to represent the motion of a car moving down the road.In a vector diagram, the magnitude of a vector quantity is represented by the size of the vector arrow. If the size of the arrow in each consecutive frame of the vector diagram is the same, then the magnitude of that vector is constant. The diagrams below depict the velocity of a car during its motion. In the top diagram, the size of the velocity vector is constant, so the diagram is depicting a motion of constant velocity. In the bottom diagram, the size of the velocity vector is increasing, so the diagram is depicting a motion with increasing velocity
Vector diagrams can be used to represent any vector quantity. In future studies, vector diagrams will be used to represent a variety of physical quantities such as acceleration, force, and momentum. Be familiar with the concept of using a vector arrow to represent the direction and relative size of a quantity. It will become a very important representation of an object's motion as we proceed further in our studies of the physics of motion.
3. Eva applies 40 N force to move her bookcase 3 m, how much work did Eva do?
Explanation:
Given:F = 40 N
d = 3 m
Required:Work
Equation:W = Fd
where: W - work, J
F - force, N
d - distance, m
Solution:W = Fd
W = (40 N)(3 m)
W = 120 Nm or 120 J
Final Answer:The work done by Eva is 120 J.When the electric potential in a generator shifts positive, then negative and back positive, _____ is created.
Answer:
★ When the electric potential in a generator shifts positive, then negative and back positive, alternating current is created.
Explanation:
Hope you have a great day :)
state the laws of refraction of light.
Answer:
Explanation:
The two laws followed by a beam of light traversing through two media are: The incident ray refracted ray, and the normal to the interface of two media at the point of incidence all lie on the same plane. The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant.
PLZZZZ HELLPPP
Which topic might a television news show present to inform viewers about
evacuation procedures during a hurricane alert? (3 points)
O The story of one man who decided not to evacuate to take care of his pets
A human-interest segment about how local hospitals deal with weather problems
O A discussion of arrests and charges brought against looters during the last hurricane
An explanation of local evacuation routes and current traffic conditions on each
Why are valence electrons so important?
A. They form no bonds with other atoms.
B. They are the electrons that interact with other atoms.
C. They are in the middle of the atom, shielding from the outside.
D. The number of valence electrons dictates what kind of element
the atom is.
Answer:
B. They are the electrons that interact with other atoms.
Explanation:
Valence electrons are the electrons in the outermost shell of an atom. These electrons are used by atoms to form bonds with other atoms during chemical bonding.
So, the basis by which atoms interacts with one another is through the valence electrons. Without the valence electrons, atomic combination to form compounds would not be possible. Valence electrons are the most loosely held electrons and they have the lowest ionization energy.If a ball is dropped and takes 6.5 seconds to hit the ground below. How far did it fall? Remember in free fall g= -9.8 m/s/s. What is this question asking you to solve for? What variables are being used?
Answer:
See the answers below.
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]y=y_{o}+v_{o}*t+\frac{1}{2}*g*t^{2} \\[/tex]
where:
y - yo = Fall distance [m]
Vo = initial velocity = 0 (dropped)
t = time = 6.5 [s]
g = gravity acceleration = 9.8 [m/s²]
Now replacing:
[tex]y-y_{o}=0 +\frac{1}{2} *9.8*6.5^{2}\\y-y_{o}=207 [m][/tex]
The question is related to the distance between the points where the ball was dropped and the ground.
The variables used are gravitational acceleration, time, fall distance, initial velocity.
Gravity affects orbits in outer space.
True or False????
what is an example of non-renewable energy source?
Answer: coal
Explanation: Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy. Once these resources are used up, they cannot be replaced, which is a major problem for humanity as we are currently dependent on them to supply most of our energy needs
What is the equivalent resistance of the circuit?
60.0Ω
120.0V
20.0Ω
Ο Α. 20.0Ω
Ο Β. 80.0Ω
C. 40.0Ω
D. 200.0Ω
Answer: B) 80.0 ohms
Explanation:
You just add the resistance 60 plus 20 equals 80
Here, the two resistors are if connected in series, then the equivalent resistance of the circuit is the sum of the individual resistances that is 80 ohms Hence, option B is correct.
What is resistance ?Resistance is the hindrance to the current through a circuit. The resistance and current are in inverse proportionality. According to Ohm's law, the voltage across the circuit is the product of the resistance and current through the circuit.
In a parallel circuit, all components are connected in the parallel fashion and the current through each component is different. But in a series circuit, current through all the components is the same.
Equivalent resistance in a series circuit = R1 + R2 + R3 ...
For parallel circuit, 1/Req = 1/R1 + 1/R2 + ...
Here the two resistors are connected in series.
Hence, Req = 20 Ω + 60Ω = 180 Ω.
Therefore, the equivalent resistance of the circuit is 180 Ω.
Find more on resistance:
https://brainly.com/question/30799966
#SPJ7
Which are two pieces of evidence supporting the big bang theory?
A. black holes and pulsars
B. dark matter and dark energy
C. eclipsing binaries and quasars
D. cosmic background radiation and Hubble's law
Group of answer choices
Answer:
I think B but i'm not sure.
Explanation:
How many wavelengths are present in the sound wave shown?
1
2
3
4
Answer:
3
Explanation:
Just did it
Answer:
3
Explanation:
edge 2021
A 10 ohm a 15 ohm and a 20 ohm resistor are connected in series across a 9v supply what Current flows
Answer:
I = 0.2 A
Explanation:
The current flowing across each resistor in a series arrangement is the same throughout the circuit. So in order to calculate the current, we must first find the equivalent resistance of all three resistors. The equivalent resistance of the resistors connected in series is given as:
[tex]R = R_{1} + R_{2} + R_{3}\\R = 10\ ohm + 15\ ohm + 20\ ohm \\R = 45\ ohm[/tex]
Now we use Ohm's law for the current:
[tex]V = IR\\\\I = \frac{V}{R}\\\\I = \frac{9 volts}{45\ ohms}\\[/tex]
I = 0.2 A
Arrange the substances in the table from the MOST to the LEAST ordered particle arrangement es ) A) wood, water, neon gas B) wood, neon gas, water water, wood, neon gas D) water, neon gas, wood
Answer:
A) wood, water, neon gas
Explanation:
Matter, which constitutes every known substances is said to exists in three states namely: gaseous, solid and liquid. Each state of matter contain particles that make up their structure.
- Solids have well arranged particles that are tightly packed together to give it its solid shape. Example is wood
- Liquids have particles that are loosely packed together, hence, can still move about. Example is water
- Gases have particles that are not packed together, hence, their ability to roam freely. Example is neon gas
Based on this, the order of MOST to LEAST ordered particle arrangement is solid - liquid- gas i.e. wood - water - neon gas.
A Box has a weight of 54.43kg and the bottom of the box is 15 sq. Inch. How much pressure the box will exert on the floor?
Answer:8.00/in^2
Explanation:
Which of the following situations will not generate stress?
a.
Driving in traffic
b.
Sleeping
c.
Opening a birthday present
d.
Watching a soap opera
Answer:
Sleeping
Explanation:
Driving in traffic is stressful because you may be late for wherever you are going,
Opening a birthday present is stressful because you don't know what is inside until you open it.
Watching a soap opera is stressful because you do not know what will happen next,
Sleeping is not stressful as long as you don't bring stressful topics to bed.
2. If an object has two forces acting on it, how can the net force equal
0?
Answer:
if they both face each other they cancel out
Explanation:if there is one on 1 side and on the other as well they cancel out and it is 0
Answer:
If the forces are equal and the forces act in oppposite direction then the net force is equal to zero
Name the Organs and functions of digestive system
Find the current if 20C of charge pass a particular point in a circuit in 10 seconds.
Answer:
2 ammeter
Explanation:
=current=charge/time
=20/10
=2
does the atmosphere filters the water in clouds?will give brainliest to correcct answer
Answer:
After a rain, they will eventually evaporate into water vapor. These airborne water molecules get carried back up into the sky to form clouds and then more rain (or snow or hail). ... So this process of evaporation can help to purify water of some of the big things it might be mixed in with.
A dog pulls on a rope attached to a box and performs 250 J of work while dragging it across the floor a distance of 10 m. What amount of force is the dog pulling with?
Answer:
F = 25 N
Explanation:
The work done by any force is given as the product of the force and displacement produced by the application of that force. Therefore, the work done by the dog when it pulls the rope attached to the box can be given by the following formula:
[tex]W = Fd\\[/tex]
where,
W = Work done by the dog while pulling the rope = 250 J
F = Force of pull applied by the dog = ?
d = displacement of the box across the floor = 10 m
Therefore,
[tex]250\ J = F(10\ m)\\\\F = \frac{250\ J}{10\ m}[/tex]
F = 25 N
What is the acceleration of a sinking rock if it has a mass of 0.25 kg and has a net force of 0.44 N acting on it?
Answer: 1.76 m/s²
Explanation:
F = mass x acceleration
0.44 N = (0.25)(a)
0.44/0.25 = 1.76
a = 1.76
